The Channel Islands and the Isle of Man are
not part of the EU for any purpose other than trade in goods. Therefore EEA citizens do not have a right to settle in the Channel Islands and nor can they exercise treaty rights in the Channel Islands.
That being said, the
Immigration (Bailiwick of Guernsey) Rules, 2008 make provisions for very similar treatment to the UK for EEA Citizens and their family members. The crucial difference is that as the Channel Islands are not a part of the EEA for freedom of movement purposes, the various applications (Family Permit, residence vignette, etc) are grants, as under the UK Immigration Rules and are not a matter of right, as with the EEA Regulations.
As it is not a part of the EU for freedom of movement purposes, if you moved to the Channel Islands, your PR clock will stop and will reset when you return (assuming no Brexit).
If you were to complete five years in the Channel Islands, it seems you would be eligible to apply for ILR (not acquiring PR automatically). And were you to progress to British citizenship in the Channel Islands, it would most likely
not confer freedom of movement in the EU either (assuming no Brexit).
I would suggest that you postpone a move until you complete your immigration journey till PR and ideally defer further till getting British citizenship in the UK.
I am not a lawyer or immigration advisor. My statements/comments do not constitute legal advice. E&OE. Please do not PM me for advice.
